Why is he like that?

Anonymous
My boyfriend is usually a really sweet person also really emotional (gets upset easily )
He often said he overthinks almost daily which i always try to reassure him. Recently when were about to meet since the long-distance for the first time he started telling me he wants to be left alone completely for 6 days. Only till we meet bc he is really scared he will get hurt again.

Online with other people he doesn’t shy away to tell others about me even when we don’t talk so it doesn’t seem like he’s looking for someone else

What i understand is that he feels scared because of the past ex’s which i understand but it feels like he is forcing himself to detach a bit emotionally so that if things get bad he won't be hurt.

I hope i could get some advice. I don’t want to leave him alone till we meet at least.
I want to know if other men feel the need to be avoidant sometimes because they’re afraid.
Why is he like that?
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